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Wintering Gray-crowned Rosy-Finches Segregate Latitudinally by Sex
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Analysis of records of 8665 Gray-crowned Rosy-Finches banded over 64 years in Montana, Wyoming, Colorado, and New Mexico revealed that the sexes tend to segregate latitudinally during winter. The sex ratios of Gray-crowned Rosy-Finches banded during winter in these four Rocky Mountain states varied linearly with latitude, males predominating toward the north (male:female ratio 2.2 in Montana), females toward the south (male:female ratio 0.6 in New Mexico).
Title: Wintering Gray-crowned Rosy-Finches Segregate Latitudinally by Sex
Description:
Analysis of records of 8665 Gray-crowned Rosy-Finches banded over 64 years in Montana, Wyoming, Colorado, and New Mexico revealed that the sexes tend to segregate latitudinally during winter.
The sex ratios of Gray-crowned Rosy-Finches banded during winter in these four Rocky Mountain states varied linearly with latitude, males predominating toward the north (male:female ratio 2.
2 in Montana), females toward the south (male:female ratio 0.
6 in New Mexico).
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